Concentration! :
Horn, Sam
Concentration! : how to focus for success / Sam Horn. - Los Altos, Calif. : Crisp Publications, c1991. - iii, 92 p. : ill. ; 26 cm.
9781560520733
90083476
Success--Psychological aspects
Mental discipline
Attention
BF637.S8 / H615 1991
Concentration! : how to focus for success / Sam Horn. - Los Altos, Calif. : Crisp Publications, c1991. - iii, 92 p. : ill. ; 26 cm.
9781560520733
90083476
Success--Psychological aspects
Mental discipline
Attention
BF637.S8 / H615 1991